Doogee F5 Replacement Battery 3.8V 2400mAh Li-Polymer

Doogee F5 — 3.8V Li-Polymer Replacement Battery

This 3.8V 2400mAh Li-Polymer cell replaces the original battery in the Doogee F5 Android smartphone. It matches the factory voltage, physical dimensions (83.96 × 58.75 × 3.50mm), and connector orientation of the stock cell. Capacity is rated at 9.12Wh — identical to the original specification.

• Doogee F5 fitment: The F5 uses a fixed battery bay with a ZIF-style flex connector. This cell matches that bay geometry and connector pinout exactly — no trimming or adapter required.
• Bench tested on actual hardware: We cycled this cell through charge and discharge on the F5 platform. The onboard charge IC accepted the cell without fault flags, and the BMS held steady through screen-on and modem-active load states.
• Fuel gauge recalibration on first use: On first use after installation, disable fast charging and run one complete discharge-charge cycle at standard rate. This lets the fuel gauge IC map the new cell's discharge curve before the charge IC applies higher current on subsequent cycles.

Why the F5 reports wrong battery percentage after a cell swap

The F5 uses a coulomb counter that builds its capacity model against the old cell's discharge curve. When you install a new cell, that stored model no longer matches the actual chemistry in the bay. The phone's fuel gauge IC reads voltage and interpolates percentage from a curve calibrated to the degraded original — so it can read 40% on a cell that is actually at 60%. One full discharge to automatic shutdown followed by a full uninterrupted charge resets the coulomb counter and re-anchors the curve to the new cell.

Sudden shutdown at 20–30% on the replacement cell

This happens when the cell voltage drops below the BMS cutoff threshold under high instantaneous load — typically the LTE modem or display backlight pulling current during what the gauge still shows as a mid-range state of charge. The cell voltage collapses faster than the gauge updates, and the BMS trips the output before the display percentage catches up. After the recalibration cycle described above, the fuel gauge tracks actual cell voltage more accurately and the shutdowns stop. If they persist past two full cycles, check that the connector is fully seated — a high-resistance contact at the flex connector produces the same voltage sag symptom under load.